2021 ABYC Marine Electrical - Set Two
Questions With Answers.
When selecting an inverter, ___ is the primary concern.
A. physical size
B. output capacity
C. connection type
D. power-feed type - ANSWER- B. output capacity
The efficiency loss through inverters is typically between ___, so a battery charger
cannot be powered from one and create a perpetual system.
A. 0.5% to 3%
B. 5% to 15%
C. 20% to 25%
D. 35% to 50% - ANSWER- B. 5% to 15%
The ___ defines how much amperage a fuse or breaker can be subjected to without
locking or welding itself into the permanently closed position.
A. maximum working cycle
B. nominal rating
C. maximum allowable charge
D. AIC rating - ANSWER- D. AIC rating
The ABYC requires a(n) ___ in any DC feed from a battery bank with a capacity over
800 CCA.
A. battery switch
B. grounding cable
C. overcurrent protection device
D. inverter - ANSWER- A. battery switch
The main circuit breaker(s) are considered to be the first breaker(s) in a circuit
connected in series with the battery. All subsequent breakers, including sub-main
breakers, connected in series with a main circuit breaker are considered to be "___
circuit breakers."
A. trolling
B. backup
C. branch
D. dedicated - ANSWER- C. Branch
A battery switch shall be installed in the ___ conductor(s) from each battery or battery
bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is unavailable.
, A. neutral
B. positive
C. negative
D. grounded
E. Band - ANSWER- B. positive
___ of the AC output waveform from some inverters may affect the operation of some
GFCI devices.
A. Harmonic distortion
B. Electromagnetic induction
C. Voltage drop
D. Electronic noise - ANSWER- A. Harmonic distortion
Since some inverters do not necessarily output a true sine waveform of AC, a DVOM
that uses a(n) ___ algorithm for interpreting what it "sees" is a must.
A. simple recursive
B. backtracking
C. true root mean square (RMS)
D. approximate - ANSWER- C. true root mean square (RMS)
Gear that functions normally when run from a shore power source but either functions
erratically or not at all when run from an inverter (or generator) is almost always a(n)
___ issue.
A. subsystem
B. wiring
C. overheating
D. waveform - ANSWER- D. waveform
A(n) ___ reads the strength of a magnetic field emission and can be used to establish a
"safe zone of separation" between inverters and magnetically sensitive equipment.
A. gauss meter
B. oscilloscope
C. DVOM multimeter
D. conductance tester - ANSWER- A. gauss meter
When installing an inverter in a split bus application, it is important to provide:
A. An isolated hot bus
B. Large inductive loads
C. An isolated neutral bus
D. Both A and C - ANSWER- D. Both A and C
The best fuse type to use for the DC feed to an inverter is:
A. AGC
B. Class T
C. ANL
D. MDL - ANSWER- B. Class T
Questions With Answers.
When selecting an inverter, ___ is the primary concern.
A. physical size
B. output capacity
C. connection type
D. power-feed type - ANSWER- B. output capacity
The efficiency loss through inverters is typically between ___, so a battery charger
cannot be powered from one and create a perpetual system.
A. 0.5% to 3%
B. 5% to 15%
C. 20% to 25%
D. 35% to 50% - ANSWER- B. 5% to 15%
The ___ defines how much amperage a fuse or breaker can be subjected to without
locking or welding itself into the permanently closed position.
A. maximum working cycle
B. nominal rating
C. maximum allowable charge
D. AIC rating - ANSWER- D. AIC rating
The ABYC requires a(n) ___ in any DC feed from a battery bank with a capacity over
800 CCA.
A. battery switch
B. grounding cable
C. overcurrent protection device
D. inverter - ANSWER- A. battery switch
The main circuit breaker(s) are considered to be the first breaker(s) in a circuit
connected in series with the battery. All subsequent breakers, including sub-main
breakers, connected in series with a main circuit breaker are considered to be "___
circuit breakers."
A. trolling
B. backup
C. branch
D. dedicated - ANSWER- C. Branch
A battery switch shall be installed in the ___ conductor(s) from each battery or battery
bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is unavailable.
, A. neutral
B. positive
C. negative
D. grounded
E. Band - ANSWER- B. positive
___ of the AC output waveform from some inverters may affect the operation of some
GFCI devices.
A. Harmonic distortion
B. Electromagnetic induction
C. Voltage drop
D. Electronic noise - ANSWER- A. Harmonic distortion
Since some inverters do not necessarily output a true sine waveform of AC, a DVOM
that uses a(n) ___ algorithm for interpreting what it "sees" is a must.
A. simple recursive
B. backtracking
C. true root mean square (RMS)
D. approximate - ANSWER- C. true root mean square (RMS)
Gear that functions normally when run from a shore power source but either functions
erratically or not at all when run from an inverter (or generator) is almost always a(n)
___ issue.
A. subsystem
B. wiring
C. overheating
D. waveform - ANSWER- D. waveform
A(n) ___ reads the strength of a magnetic field emission and can be used to establish a
"safe zone of separation" between inverters and magnetically sensitive equipment.
A. gauss meter
B. oscilloscope
C. DVOM multimeter
D. conductance tester - ANSWER- A. gauss meter
When installing an inverter in a split bus application, it is important to provide:
A. An isolated hot bus
B. Large inductive loads
C. An isolated neutral bus
D. Both A and C - ANSWER- D. Both A and C
The best fuse type to use for the DC feed to an inverter is:
A. AGC
B. Class T
C. ANL
D. MDL - ANSWER- B. Class T
